On this forum you really get both opinions. A few posters dislike the 350 J layout with a passion, and some of us think that the layout difference with the 777 is minimal and that by contrast, the 350 is a much nicer - indeed,currently the nicest existing - aircraft in terms of both air and noise qualities making it much preferable. So on my side, I am very much on the 350 side but do know that the view is not unanimous (and with a search, you'll find much discussion of those comparisons in our forum).